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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.74 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

20.52 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

165 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.49 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

20.65 s

Page Load Progression

557 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.3 s
3.9 s
4.5 s
Checks
17
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
7.7 MB transferred, 87 requests
FIX
7.7 MB transferred, 87 requests
Critical::
Page weighs 9.1 MB (7.7 MB transferred)
Warning::
Images are 5.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.2 MB
Info::
87 HTTP requests
Info::
Estimated 1.6 g CO2 per page load
7.7 MB / 2.4 MB budget
7.7 MB transferred
87 requests
1.6 g CO2 per page load
Images 5.2 MiB 67%
Other 1.9 MiB 24%
JavaScript 455.9 KiB 6%
Fonts 133.3 KiB 2%
CSS 67.1 KiB 1%
HTML 35.2 KiB 0%
Other 6.3 KiB 0%
Other 2.2 KiB 0%
Other 1.5 KiB 0%
Other 547 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (7.7 MiB of 7.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
87 resources · 7.7 MB · 214 KB savings available
FIX
87 resources · 7.7 MB · 214 KB savings available
Warning::
Page weight 6.7 MB over 1MB target
Got: 7.7 MB Expected: ≤ 1 MB
Info::
~214 KB of savings available
Warning::
86 third-party resources (100% of weight)
Info::
10 resources over 200KB
87 resources · 7.7 MiB · 86 third-party 6.7 MiB over 1MB target
Image 67% · 5.2 MiB
Media 24% · 1.9 MiB
JavaScript 6% · 455.9 KiB
Font 2% · 133.3 KiB
CSS 1% · 67.1 KiB
Document 0% · 36.1 KiB
Other 0% · 7.5 KiB

~214.1 KiB of savings available

Remove unused JavaScript: 214.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://washu.edu/app/uploads/2026/01/1-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/4-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://qa-washuedu-2024-washu.pantheonsite.io/app... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://qa-washuedu-2024-washu.pantheonsite.io/app... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/2-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/01/3-1024x1024.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2025/11/MLTM-3388_48... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://washu.edu/app/uploads/2026/03/AdvancingOur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 5.2 MB
0 oversized -0 KB
27 legacy format
8 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1607ms total JS execution
REVIEW
1607ms total JS execution
Warning::
Unattributable: 584ms CPU time
Warning::
https://washu.edu/: 495ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=GT-5RF...: 212ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TXV...: 152ms CPU time
Info::
https://washu.edu/app/plugins/washu-cludo-function...: 86ms CPU time
Warning::
Third-party scripts: 1607ms (100% of total)

Main Thread Breakdown

Other 37% Script Evaluation 27% Style & Layout 21% Script Parsing & Compilation 7% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable584ms15ms0ms3rd
https://washu.edu/495ms9ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-5RF8WH5212ms177ms33ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TXV3L6Q152ms118ms34ms3rd
https://washu.edu/app/plugins/washu-cludo-functionality//cludo-config/dist/js/cludo-search-results.js?ver=1.0.386ms66ms19ms3rd
https://washu.edu/app/themes/antipasto/build/scripts.js?ver=4.0.4577ms16ms2ms3rd
C
JS Bundles
Action
18 scripts, 214 KB unused
REVIEW
18 scripts, 214 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TXV...: 67 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-5RF...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://washu.edu/app/plugins/washu-cludo-function...: 57 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://customer.cludo.com/scripts/bundles/search-...: 25 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 214 KB
214 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TXV3L6Q131 KB67 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-5RF8WH5157 KB65 KB (41%)✓3rd
https://washu.edu/app/plugins/washu-cludo-functionality//cludo-config/dist/js/cludo-search-results.js?ver=1.0.388 KB57 KB (64%)✓3rd
https://customer.cludo.com/scripts/bundles/search-script.min.js?ver=1.0.351 KB25 KB (51%)✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-story-carousel.js?ver=e36bc714e21d6a96886e1 KB—✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-small-photo-promo.js?ver=1.0.384 KB—✓3rd
https://washu.edu/wp/wp-includes/js/dist/dom-ready.min.js?ver=f77871ff7694fffea3811 KB—✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-video-topper.js?ver=4.0.451 KB—✓3rd
https://washu.edu/app/plugins/washu-emergency-alerts/js/washu-emergency-alerts.js?ver=1.5.31 KB—✓3rd
https://washu.edu/app/themes/washuedu-theme/build/script-flag-half-staff.js?ver=eb92675966cf04e5ddd81 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
6 fonts (133 KB)
PASS
6 fonts (133 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

133 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 3.7 s LCP 20.5 shttps://use.typekit.net/af/eeee61/00000000000000007735c082/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/eeee61/00000000000000007735c082/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.4 KiB — 5 ms — font-display: swaphttps://use.typekit.net/af/4db78a/00000000000000007735c074/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/4db78a/00000000000000007735c074/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 19.8 KiB — 6 ms — font-display: swaphttps://use.typekit.net/af/e456f5/00000000000000007735e5a2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/e456f5/00000000000000007735e5a2/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 34.6 KiB — 13 ms — font-display: swaphttps://use.typekit.net/af/cd024c/00000000000000007735c086/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/cd024c/00000000000000007735c086/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 19.8 KiB — 6 ms — font-display: swaphttps://use.typekit.net/af/ffa0cc/00000000000000007735c08a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3l https://use.typekit.net/af/ffa0cc/00000000000000007735c08a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3 — 20.3 KiB — 10 ms — font-display: swaphttps://use.typekit.net/af/34725e/00000000000000007735c091/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/34725e/00000000000000007735c091/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 19.3 KiB — 11 ms — font-display: swap
l woff2 swap
Size 19 KB
Load time 5 ms
Start 361 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 6 ms
Start 361 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 35 KB
Load time 13 ms
Start 361 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 6 ms
Start 362 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 10 ms
Start 362 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 11 ms
Start 362 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
4
prefetch
—

5 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
87 requests over 2149ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 3.7 s LCP 20.5 shttps://wustl.edu// https://wustl.edu/ — 301 — 204 B — 9 ms — h2https://washu.edu/washu.edu/ https://washu.edu/ — 200 — 35.2 KiB — 16 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-flag-half-staff.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-flag-half-staff.css?ver=1.0.38 — 200 — 1.4 KiB — 121 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-nav-item.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-nav-item.css?ver=1.0.38 — 200 — 218 B — 125 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-nav-link.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-nav-link.css?ver=1.0.38 — 200 — 691 B — 116 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-nav-overview.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-nav-overview.css?ver=1.0.38 — 200 — 285 B — 123 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-news-list.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-news-list.css?ver=1.0.38 — 200 — 656 B — 123 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-small-photo-promo.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-small-photo-promo.css?ver=1.0.38 — 200 — 1.9 KiB — 125 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-social-promo.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-social-promo.css?ver=1.0.38 — 200 — 1.2 KiB — 119 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-story-carousel.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-story-carousel.css?ver=1.0.38 — 200 — 1.8 KiB — 114 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-vertical-border.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-vertical-border.css?ver=1.0.38 — 200 — 974 B — 130 ms — h2https://washu.edu/app/themes/washuedu-theme/build/style-video-topper.css?ver=4.0.45washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/build/style-video-topper.css?ver=4.0.45 — 200 — 832 B — 127 ms — h2https://washu.edu/app/themes/antipasto/build/style-call-out.css?ver=4.0.45washu.edu/app/themes/antipasto/buil... https://washu.edu/app/themes/antipasto/build/style-call-out.css?ver=4.0.45 — 200 — 5.5 KiB — 129 ms — h2https://washu.edu/app/plugins/washu-emergency-alerts/css/style.css?ver=1.5.3washu.edu/app/plugins/washu-emergen... https://washu.edu/app/plugins/washu-emergency-alerts/css/style.css?ver=1.5.3 — 200 — 832 B — 126 ms — h2https://washu.edu/app/themes/antipasto/style.css?ver=4.0.45washu.edu/app/themes/antipasto/styl... https://washu.edu/app/themes/antipasto/style.css?ver=4.0.45 — 200 — 38.4 KiB — 132 ms — h2https://washu.edu/app/themes/washuedu-theme/style.css?ver=1.0.38washu.edu/app/themes/washuedu-theme... https://washu.edu/app/themes/washuedu-theme/style.css?ver=1.0.38 — 200 — 7.0 KiB — 128 ms — h2https://washu.edu/app/plugins/washu-cludo-functionality/style.css?ver=1.0.3washu.edu/app/plugins/washu-cludo-f... https://washu.edu/app/plugins/washu-cludo-functionality/style.css?ver=1.0.3 — 200 — 3.8 KiB — 125 ms — h2https://use.typekit.net/mav2zlt.cssuse.typekit.net/mav2zlt.css https://use.typekit.net/mav2zlt.css — 200 — 1.4 KiB — 194 ms — h2https://washu.edu/app/uploads/2024/06/MLTM-398_0417-2.jpgwashu.edu/app/uploads/2024/06/MLTM-... https://washu.edu/app/uploads/2024/06/MLTM-398_0417-2.jpg — 200 — 233.7 KiB — 135 ms — h2https://washu.edu/app/uploads/2024/06/20231019_NRB-WUCCI_0225.jpgwashu.edu/app/uploads/2024/06/20231... https://washu.edu/app/uploads/2024/06/20231019_NRB-WUCCI_0225.jpg — 200 — 201.4 KiB — 133 ms — h2https://washu.edu/app/uploads/2025/12/civil-discourse-feature_750x500-e1774643198167.jpgwashu.edu/app/uploads/2025/12/civil... https://washu.edu/app/uploads/2025/12/civil-discourse-feature_750x500-e1774643198167.jpg — 200 — 39.6 KiB — 117 ms — h2https://washu.edu/app/uploads/2024/06/MLTM-1155_0689-1.jpgwashu.edu/app/uploads/2024/06/MLTM-... https://washu.edu/app/uploads/2024/06/MLTM-1155_0689-1.jpg — 200 — 202.8 KiB — 120 ms — h2https://washu.edu/app/uploads/2024/07/MLTM-843_5274-2.jpgwashu.edu/app/uploads/2024/07/MLTM-... https://washu.edu/app/uploads/2024/07/MLTM-843_5274-2.jpg — 200 — 196.9 KiB — 125 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1607ms · 418KB · $21/mo
Unattributable
Other
Costly
Execution 584ms
Transfer 0 KB
Monthly Cost $8/mo
washu.edu
Other
Costly
Execution 495ms
Transfer 35 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 212ms
Transfer 157 KB
Unused 41%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 152ms
Transfer 131 KB
Unused 52%
Monthly Cost $2/mo
washu.edu
Other
Optional
Execution 86ms
Transfer 88 KB
Unused 64%
Monthly Cost $1/mo
washu.edu
Other
Optional
Execution 77ms
Transfer 6 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 584ms and costs ~$8/month
  • washu.edu adds 495ms and costs ~$7/month
  • Google Tag Manager adds 212ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 584ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

washu.edu takes 495ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 212ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

52% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

64% of washu.edu's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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